AN ARTICULATION INDEX BASED PROCEDURE FOR PREDICTING THE SPEECH RECOGNITION PERFORMANCE OF HEARING-IMPAIRED INDIVIDUALS
AN ARTICULATION INDEX BASED PROCEDURE FOR PREDICTING THE SPEECH RECOGNITION PERFORMANCE OF HEARING-IMPAIRED INDIVIDUALS
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DOI：
10.1121/1.394082
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发表时间：
1986-07-01
影响因子：
2.4
通讯作者：
SHERBECOE, RL
中科院分区：
文献类型：
--
作者：
PAVLOVIC, CV;STUDEBAKER, GA;SHERBECOE, RL
为单独的正常听力听众而开发的清晰度指数计算程序[C.帕夫洛维奇和 G. Studebaker，J. Acoust。苏克。是。 75, 1606-1612 (1984)]被修改以解释感音神经性听力障碍引起的阈上语音处理的恶化。来自四名正常听力受试者和四名听力受损受试者的数据被用来将听力灵敏度的损失与安静和噪音中语音处理的恶化联系起来。新程序仅需要听力阈值测量，并对 Pavlovic 和 Studebaker (1984) 的原始 AI 程序进行了以下两项修改：(1) 语音和噪声频谱密度在带宽上积分，当以分贝表示时，该带宽比临界带宽大听力损失的 10%。这与未修改的过程形成对比，在未修改的过程中积分是在关键带宽上执行的。 (2) 每个频率对人工智能的贡献是其在未修改的人工智能程序中的贡献与“语音脱敏因子”的乘积。脱敏因子被指定为听力损失的函数。通过比较四名听力受损受试者在不同语音过滤和噪声掩蔽条件下的预期语音识别分数和观察到的语音识别分数，评估未修改和修改后的计算程序的预测准确性。修改后的程序对于一般应用来说似乎是准确的。相比之下，未经修改的过程仅对于在单个监听器上的各种条件下获得的结果进行相互比较的应用来说显得准确。
An articulation index calculation procedure developed for use with individual normal-hearing listeners [C. Pavlovic and G. Studebaker, J. Acoust. Soc. Am. 75, 1606-1612 (1984)] was modified to account for the deterioration in suprathreshold speech processing produced by sensorineural hearing impairment. Data from four normal-hearing and four hearing-impaired subjects were used to relate the loss in hearing sensitivity to the deterioration in speech processing in quiet and in noise. The new procedure only requires hearing threshold measurements and consists of the following two modifications of the original AI procedure of Pavlovic and Studebaker (1984): (1) The speech and noise spectrum densities are integrated over bandwidths which are, when expressed in decibels, larger than the critical bandwidths by 10% of the hearing loss. This is in contrast to the unmodified procedure where integration is performed over critical bandwidths. (2) The contribution of each frequency to the AI is the product of its contribution in the unmodified AI procedure and a "speech desensitization factor." The desensitization factor is specified as a function of the hearing loss. The predictive accuracies of both the unmodified and the modified calculation procedures were assessed by comparing the expected and observed speech recognition scores of four hearing-impaired subjects under various conditions of speech filtering and noise masking. The modified procedure appears accurate for general applications. In contrast, the unmodified procedure appears accurate only for applications where results obtained under various conditions on a single listener are compared to each other.